Application of femtosecond laser mass spectrometry to the analysis of volatile organic compounds
Application of femtosecond laser mass spectrometry to the analysis of volatile organic compounds
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DOI：
10.1016/j.jasms.2010.02.020
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发表时间：
2010-07
影响因子：
3.2
通讯作者：
Min Liu;Chengyin Wu;Zhifeng Wu;Hong Yang;Q. Gong;Wei Huang;T. Zhu
中科院分区：
文献类型：
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作者：
Min Liu;Chengyin Wu;Zhifeng Wu;Hong Yang;Q. Gong;Wei Huang;T. Zhu
飞秒激光具有高强度和超短脉冲宽度。在这种强激光场作用下，分子会发生隧道电离。我们研究了强飞秒激光脉冲辐照下多种分子的质谱。这些分子包括人类呼吸和大气中含有的一些典型的挥发性有机化合物。结果表明，所有这些分子都可以被强飞秒激光脉冲电离。观察到每个分子的主要母离子和一些特征离子片段。破碎程度可以通过调节激光强度来控制。此外，通过增加激光强度，每个分子都可以发生饱和电离。这些特征表明，飞秒激光质谱可以作为一种灵敏的工具来识别和量化人体呼吸中的挥发性有机化合物。
Femtosecond (fs) lasers have high intensity and ultrashort pulse duration. Tunneling ionization occurs for molecules subject to such intense laser fields. We have studied the mass spectra of a variety of molecules irradiated by intense fs laser pulses. These molecules include some typical volatile organic compounds contained in human breath and in the atmosphere. The results demonstrate that all of these molecules can be ionized by intense fs laser pulses. Dominant parent ion and some characteristic ionic fragments are observed for each molecule. The degree of fragmentation can be controlled by adjusting the laser intensity. Moreover, saturation ionization can occur for each molecule by increasing the laser intensity. These features indicate that fs laser mass spectrometry can be a sensitive tool to identify and quantify volatile organic compounds in human breath.